part_3_modulation - BPSK ISI Eye Diagram ICI Example Analog...

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CIS 6930 Powerline Communications Richard Newman Spring 2010
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Modulation - Outline Effects of Impairments ICI, ISI, Noise Analog AM, FM Traditional Digital ASK, FSK, PSK, QAM Special Digital PPM, OFDM, Wavelet Modulation Conclusions
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Impairments ISI – Intersymbol Interference Effect of multipath interference, delay distortion Also effect of band-limited channel Causes symbols to “smear” into each other ICI – Interchannel interference Crosstalk between channels in OFDM Noise Discussed earlier
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Unformatted text preview: BPSK ISI Eye Diagram ICI Example Analog AM FM Traditional Digital ASK FSK PSK QAM Special Digital PPM OFDM – Basic – Bit loading WM Spread Spectrum – FHSS – DSSS Conclusions Need special techniques to deal with PL channels – traditional approaches don't work PPM appropriate for long distances when data rate and bandwidth efficiency can be low OFDM, WM are appropriate for high data rate, broadband applications...
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